Lband + GPS Quadrifilar Helical Antenna

Dual-band receive antenna:
Lband - 1525 to 1560 MHz
GPS (L1) - 1574 to 1576MHz
Patented very low noise LNA: 1dB
High gain LNA: 27dB
Low current: 10 mA (max)
15KV ESD circuit protection
Weatherproof housing: IP67
Mounting: Standard 5/8 pole thread
RoHS compliant

WS1551QF Lband + GPS Quadrifilar Helical Antenna

The WS1551QF is an active right hand circularly polarized quadrifilar helical antenna. It provides an omni-directional, cardoid radiation pattern, with peak gain optimized at elevation angles between 0° and 40°. The WS1551QF is a high performance wideband antenna, covering both the L-band downlink frequency band (1525 to 1560 MHz) and the GPS (L1) frequency band (1574 to 1576 MHz). It features a precisely tuned quadrifilar antenna element, 15KV ESD circuit protection, a high gain two-stage low noise amplifier (LNA) and a ceramic filter. As well it is housed in a weather proof, industrial grade enclosure with a bulkhead TNC Jack connector. At high latitudes, where the elevation angle to satellites is 30° or less, the WS1551QF antenna provides a significant performance advantage over the more commonly used patch antennas.

Technical Specifications

Frequency Passband

1525 to 1576 MHz

Gain of element

+4.5 dBic (typ.) @ 35°Elevation
-2.5 dBic (typ.) @ Zenith

Polarization

RHCP

Radiation Pattern

Omni-directional (cardoid)

Axial ratio

3 dB (max.)

G/T

-15.5 dB/K @ 30° (off Satellite)

Noise figure

0.5 dB (LNA)

Gain

29 dB typ. 1530 to 1560 MHz

Gain flatness

+/-1 dB, 1530 to 1560 MHz

Gain

27 dB typ at 1575.42 MHz

Output VSWR

1.5:1

Frequency Passband

1525 to 1576 MHz

Gain

Lband 27 dB, L1 26 dB (typ.)

Gain bandwidth:

1 dB (typ.) 1529 to 1560 MHz
2 dB (typ.) 1525 to 1576 MHz

Noise Figure

29.5 dBi min. at 90° (at 1575.42 MHz)

Out-of-Band Rejection

500MHz - 1200MHz > 45dB
1200MHz - 1450MHz > 27 dB
1650MHz - 1800MHz > 30 dB
800MHz - 2100MHz > 50 dB

Return Loss

> 16 dB

Impedance

50 Ω

Operating Voltage

3 to 15 VDC

Current

10 mA @ 5.5VDC (typ.)

Temperature

-40 to +85°C

Weatherproof

IP67

Vibration

5 to 20 Hz: 0.05 g²/Hz
20 to 150 Hz: -3 dB/octave

Shock

Vertical axis 50G, other axes 30G

RoHs Compliant

Dimension

83.8 mm dia x 266.7 mm
(3.5 inch dia x 10.5 inch)

Weight

454 g ( 16 oz )

Mounting

5/8 in - 11UNC (BSW)

Housing

Body - white plastic
Base - black anodized aluminum

Connector

TNC jack (female)